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Finding the Fourth Proportional to 683.80, 1,023.68 and 439.60

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Solution

The fourth proportional to 683.80, 1,023.68 and 439.60 is: 658.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.80 : 1,023.68 = 439.60 : x
  2. Step 2: Convert to fraction form
    683.80/1,023.68 = 439.60/x
  3. Step 3: Cross multiply
    683.80x = 1,023.68 × 439.60
  4. Step 4: Simplify right side
    683.80x = 450,009.73
  5. Step 5: Solve for x
    x = 450,009.73/683.80
  6. Step 6: Final answer
    x = 658.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.